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Antenna Analysers

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You might expect antenna analysers to measure antenna pattern as well ... 2-Port VNA - As one port plus loss measurement Types of Antenna Analyser 3 Type ... – PowerPoint PPT presentation

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Title: Antenna Analysers


1
Antenna Analysers
  • Bryan, G8DKK

2
Whats in a Name?
  • You might expect antenna analysers to measure
    antenna pattern as well as VSWR
  • In general - they dont!
  • They measure VSWR in all its guises of real and
    sometimes imaginary parts
  • VSWR, Reflection coefficient (magnitude phase),
    Return Loss (dB), Impedance Z R jX

3
Antenna Measuring
  • Before buying an antenna analyser consider what
    you do with antennas
  • Buy an antenna, erect it and assume its right
  • Buy an antenna, erect it then check/adjust it
  • Construct an antenna and assume its right
  • Build or buy and fiddle with it to optimise it
    for frequency or bands or bandwidth
  • Construct an antenna then measure and calculate
    matching components (per band)

4
Antenna Analysers
  • Parameters that might influence choice
  • Standalone or work with PC
  • Frequency
  • Range, Stability, Resolution, Accuracy, Sweep
  • Display
  • Display size resolution, Pixel resolution,
  • Available measurement parameters
  • VSWR, Return loss, Z, R, X, sign of X, phase, TDR
  • Size, Weight, Cost

5
Types of Antenna Analyser
  • There are many ways to group these analysers
  • By type or method of display
  • By measurement capability
  • Frequency Range

6
Types of Antenna Analyser 2
  • Measurement Capability
  • VSWR only SWR Indicators
  • VSWR, Z, R X but not sign of X
  • VSWR, Z, R X with sign, Phase, Smith Chart (and
    often TDR) these are known as one-port Vector
    Network Analysers (VNA)
  • 2-Port VNA - As one port plus loss measurement

7
Types of Antenna Analyser 3
  • Type of Display
  • Analogue Meter
  • Text only LCD (LED)
  • Graphical LCD (LCD size) Rectangular (X-Y) and
    polar (Smith Chart) displays
  • PC screen
  • Frequency Range Stability
  • L-C Oscillator, manual tuning
  • Synthesised
  • Frequency range affects price

8
Antenna Analysers
VSWR Indicators
9
MFJ-207
10
YouKits FG-01
11
MFJ-259C
12
Analysers Calibration
  • Analysers with pre-calibration
  • Most of the following analysers are provided with
    an in-built, full frequency range calibration
  • Why Calibrate?
  • Improve accuracy drift with time temperature,
    cal over narrow sweep width
  • Calibrate at the end of a cable
  • Calibration parts required
  • Short, Open, Load 50O in same connector as
    analyser or cable

13
Palstar ZM30
14
MFJ-226 (Times Technology)
15
Times Tech (HK) T100
VHF/UHF
16
RigExpert AA-54
17
RigExpert AA-230 zoom
UU9JDR
18
RigExpert AA-600
19
MyDel Sark 110
20
Analysers with 2 Ports
  • These analysers usually operate via a PC
  • Measure all parameters like a 1-port plus
    insertion loss. Cal at end of cable as standard
  • They have an additional receiver port that can be
    included in the calibration process
  • There is no internally stored calibration so
    calibration is essential as is a set of
    calibration parts (Short, Open, Load).
  • Calibrations usually stored in the PC as files
  • Not recommended as a first analyser

21
VNWA 3 (SDR-Kits)
DG8SAQ
22
mRS MiniVNA Tiny
23
Price Comparison
Model Connector Max Frequency Price
MFJ-207 SO239 30MHz 99
REU AA-30 SO239 30MHz 190
YouKits FG01 SO239 72MHz 240
MFJ-259C SO239 230MHz 250
REU AA-54 SO239 54MHz 280
MFJ-226 N 230MHz 330
SARK 110 MCX SMA 200MHz 330
ZM30 BNC 30MHz 367
miniVNA Tiny SMA 3000MHz 380
VNWA3 SMA 1300MHz 407
REU AA-230 Z N 230MHz 427
REU AA-600 N 600MHz 470
REU AA-1400 N 1400MHz 900
       
24
Summary
  • If you decide to buy an Antenna Analyser
  • Decide what it will do for you
  • Is it worth 300 for once a year use?
  • Are you able to borrow a unit?
  • Match the frequency range to your requirements
  • Choose a unit that will best match with your
    intended use

25
Websites
  • Here are some useful websites
  • www.mfjenterprises.com
  • www.rigexpert.com (recommended reading)
  • www.mixw.co.uk (KMK)
  • www.sark110.com
  • www.sdr-kits.co.uk
  • www.miniradiosolutions.com
  • www.timestechnology.com.hk
  • www.arraysolutions.com
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